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mmc: Add a function to dump the mmc capabilities

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This adds a simple helper function to display information (bus width and
mode) based on a capability mask. Useful for debug.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Jean-Jacques Hiblot 2017-09-21 16:29:54 +02:00 committed by Jaehoon Chung
parent 35f9e196f9
commit 4c9d2aaa7e
2 changed files with 25 additions and 0 deletions
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24
drivers/mmc/mmc.c
View File

@ -1136,6 +1136,30 @@ static void mmc_set_bus_width(struct mmc *mmc, uint width)
mmc_set_ios(mmc); mmc_set_ios(mmc);
} }
#if CONFIG_IS_ENABLED(MMC_VERBOSE) || defined(DEBUG)
/*
* helper function to display the capabilities in a human
* friendly manner. The capabilities include bus width and
* supported modes.
*/
void mmc_dump_capabilities(const char *text, uint caps)
{
enum bus_mode mode;
printf("%s: widths [", text);
if (caps & MMC_MODE_8BIT)
printf("8, ");
if (caps & MMC_MODE_4BIT)
printf("4, ");
printf("1] modes [");
for (mode = MMC_LEGACY; mode < MMC_MODES_END; mode++)
if (MMC_CAP(mode) & caps)
printf("%s, ", mmc_mode_name(mode));
printf("\b\b]\n");
}
#endif
static int sd_select_bus_freq_width(struct mmc *mmc) static int sd_select_bus_freq_width(struct mmc *mmc)
{ {
int err; int err;

1
include/mmc.h
View File

@ -426,6 +426,7 @@ enum bus_mode {
}; };
const char *mmc_mode_name(enum bus_mode mode); const char *mmc_mode_name(enum bus_mode mode);
void mmc_dump_capabilities(const char *text, uint caps);
/* /*
* With CONFIG_DM_MMC enabled, struct mmc can be accessed from the MMC device * With CONFIG_DM_MMC enabled, struct mmc can be accessed from the MMC device